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Arxiomyces sp. P4502
Family: CeratostomataceaeGenus: Arxiomyces
Conidial structures not known.
Ascomata perithecia, 150-250 µm diam., scattered or in small clusters, superficial, sometimes situated on a thin subicular hyphal layer, ± globose, dark brown to black, with a long cylindrical neck 30-40 µm diam. and 200-600 µm in length. Peridium coriaceous, glabrous or with sparse hypha-like hairs, translucent with the ascospores within visible through the wall as a dark brown mass, composed of an outer layer of large angular cells and an inner layer of pale flattened tissue, the cells of the neck elongate and ± parallel, the ostiole not surrounded by setae. Interascal tissue not seen. Asci not seen, probably quickly evanescent. Ascospores arranged irregularly, (3.6-) 4.4-5 x 2-2.4 µm, ovoid to fusiform-ellipsoidal, olivaceous brown, aseptate, smooth, fairly thick-walled, often biguttulate, with a large basal germ pore to ca 0.8 µm diam. and sometimes a smaller apical germ pore (to ca 0.4 µm diam.), gelatinous sheath and appendages not seen.